CN108189689B - Battery management device and method of integrated safety unit - Google Patents
Battery management device and method of integrated safety unit Download PDFInfo
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- CN108189689B CN108189689B CN201711475047.3A CN201711475047A CN108189689B CN 108189689 B CN108189689 B CN 108189689B CN 201711475047 A CN201711475047 A CN 201711475047A CN 108189689 B CN108189689 B CN 108189689B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention discloses a battery management device and a method of an integrated safety unit, comprising the following steps: the battery management device collects battery information, controls the jump of the battery state and protects the battery; and the encryption chip is arranged on the battery management device and is used for encrypting the interactive communication data. By adopting the battery management device integrated with the safety unit, the battery management device can effectively protect the data in the battery, and the control of a battery system by implementing an encryption algorithm is safer.
Description
Technical Field
The invention belongs to the field of intelligent electric automobiles, and particularly relates to a battery management device and method integrated with a safety unit.
Background
Electric vehicle technology has been rapidly developed under the impetus of governments and large automobile companies due to energy and environmental concerns. With the development of battery technology, electric vehicles are currently rapidly entering the lives of people, and the market occupancy of electric vehicles is getting higher and higher.
The battery is the core of the electric vehicle, a set of high-safety battery management device is very important for the electric vehicle, the battery management devices on the market are concentrated on solving the functional problem at present, and the consideration on the safety aspect is far from insufficient.
The conventional battery management device is mainly divided into a master-slave framework, and a main board BMS realizes the collection of all battery information and performs information interaction and state skip with a whole vehicle or equipment. The information interaction and the state skip between the BMS and the whole vehicle or equipment are realized through CAN communication, the communication has no strict protective measures, and the message on the CAN network is intercepted, which means that the data in the battery system is stolen and CAN be easily controlled, so that a design scheme of a battery management device integrating safety is needed to be provided.
Disclosure of Invention
The invention aims to ensure that the data of the battery management device is not easy to steal and the battery system is not easy to control through technical encryption, so that the battery system is safer.
According to an aspect of the present invention, there is provided a battery management apparatus integrated with a safety unit, the system including:
the battery management device collects battery information, controls the jump of the battery state and protects the battery;
and the encryption chip is arranged on the battery management device and is used for encrypting the interactive communication data.
Preferably, the battery management device is connected to the handheld device, the vehicle control unit and the charging device through a CAN bus.
Preferably, the vehicle control unit acquires data of the battery management device and sends a control command to the battery management device.
Preferably, the handheld device is used for binding the private key for the first time, changing the private key and diagnosing the functional fault of the whole vehicle.
Preferably, the charging device is used for charging a battery.
Preferably, the battery management device includes a control unit, and the control unit receives a control instruction sent by the vehicle control unit to control the jump of the battery state.
Preferably, the interaction mode of the communication data is message exchange.
Preferably, the battery information includes: battery grouping information, battery SOC, battery capacity, battery charge-discharge power, and battery fault information.
According to another aspect of the present invention, there is provided a battery management method of an integrated safety unit, the method including the steps of: setting a private key for a user, and binding the user for the first time; the vehicle control unit and/or the handheld device sends a private key set by a user to the battery management device; the battery management device judges whether the private key is correct or not, and if not, the communication is directly ended; otherwise, the private key is sent to an encryption chip; the encryption chip generates a new secret key in real time by using a secret key algorithm, and sends the new secret key to the battery management device, and the battery management device sends the new secret key to the vehicle control unit and/or the handheld device and performs encryption communication by using the new secret key; the battery management device judges whether the communication with the handheld equipment is finished or not, and if the communication is not finished, the communication is continued; otherwise, the battery management device and the handheld device finish communication after storing the current secret key.
Preferably, the setting of the private key for the user, and the performing of the first user binding includes:
initializing the battery management device by using the handheld equipment;
the user sets the private key through the handheld device and sends the private key to the battery management device;
and the battery management device receives the private key and feeds back successful encryption binding after initializing the encryption chip.
The invention has the beneficial effects that: the encryption chip is added on the mainboard of the battery management device, the secret key algorithm and the communication mechanism are added on the mainboard software of the battery management device, and the secret key algorithm and the communication mechanism are synchronously added in the software of the handheld device and the whole vehicle controller which are in information interaction with the battery management device, so that the battery management device can effectively protect data in the battery, and the control of the battery system is safer by implementing the encryption algorithm.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of battery management device information interaction of an integrated safety unit according to the present invention.
Fig. 2 shows a flow chart of a battery management method of an integrated safety unit according to the present invention.
FIG. 3 illustrates a flow diagram of user first binding in accordance with the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
Fig. 1 shows a schematic diagram of battery management device information interaction of an integrated safety unit according to the present invention.
As shown in fig. 1, in this embodiment, the safety unit-integrated battery management apparatus according to the present invention may include: the battery management device 101 is used for acquiring battery information, controlling the jump of the battery state and protecting the battery by the battery management device 101; and the encryption chip is arranged on the battery management device 101 and is used for encrypting the interactive communication data.
The embodiment enables the data of the battery management device not to be stolen easily and the battery system not to be controlled easily through technical encryption, so that the battery system is safer.
In one example, the battery management apparatus 101 is connected to the handheld device 102, the vehicle control unit 104, and the charging device 103 through a CAN bus.
In particular, CAN, a controller area network, belongs to the field of industrial field buses. Compared with a general communication bus, the data communication of the CAN bus has outstanding reliability, real-time performance and flexibility, and the application of the CAN bus in the automobile field is the most extensive.
In one example, the vehicle control unit 104 acquires data of the battery management apparatus 101 and sends a control command to the battery management apparatus 101.
In one example, the battery management apparatus 101 includes a control unit, and the control unit receives a control instruction sent by the vehicle control unit 104 to control the jump of the battery state.
Specifically, the vehicle controller 104 is mainly used for coordination and control of a vehicle power system, and performs comprehensive operation processing according to a state of the vehicle from a vehicle control perspective, and sends an operation result to the battery management device 101, and the battery management device 101 executes a command of the vehicle controller 104 and feeds back the execution result to the vehicle controller 104.
In one example, the handheld device 102 is used to first bind a private key, change the private key, and diagnose a malfunction of the entire vehicle function.
Specifically, the handheld device 102 is mainly used for diagnosing a functional fault of the entire vehicle, and in addition, after the user purchases a battery system or the entire vehicle, the user needs to set a private key through the handheld device 102 to perform first binding of the user, and if the user needs to change the private key, the implementation can also be performed through the handheld device 102.
In one example, the charging device 103 is used to charge a battery.
Here, although the charging device 103 is connected to the battery management apparatus 101 through the CAN bus, the communication between the charging device 103 and the battery management apparatus 101 is not encrypted because the communication between the two is a national standard and a key cannot be added.
In one example, the communication data is exchanged in a message exchange manner.
Specifically, the message exchange does not need to establish a special communication line for both communication parties in advance, so that connection establishment delay does not exist, and a user can send a message at any time; and the two communication parties do not fixedly occupy a communication line, but partially occupy the physical path in different periods of time, so that the utilization rate of the communication line is greatly improved.
In one example, the battery information includes: battery grouping information, battery SOC, battery capacity, battery charge-discharge power, and battery fault information.
In particular, a lithium battery is the most widely used battery for an electric vehicle, and due to the inherent characteristics of the lithium battery material, the performance of the battery pack rapidly deteriorates when the battery pack is overcharged, overdischarged or over-heated, and finally the battery pack is unusable, and by detecting the above battery information, the overall state of the battery is evaluated and effectively managed, so that the battery life can be prolonged while the battery performance is maintained.
In the embodiment, the encryption chip is added on the mainboard of the battery management device, the key algorithm and the communication mechanism are added on the mainboard software of the battery management device, and the key algorithm and the communication mechanism are synchronously added in the software of the handheld device and the whole vehicle controller which are in information interaction with the battery management device, so that the battery management device can effectively protect the data in the battery, and the control of the battery system is safer by implementing the encryption algorithm.
Example 2
According to an embodiment of the present invention, there is provided a battery management method of an integrated safety unit, the method including the steps of: setting a private key for a user, and binding the user for the first time; the vehicle control unit and/or the handheld device sends a private key set by a user to the battery management device; the battery management device judges whether the private key is correct or not, and if not, the communication is directly ended; otherwise, sending the private key to the encryption chip; the encryption chip generates a new secret key in real time by using a secret key algorithm, and sends the new secret key to the battery management device, and the battery management device sends the new secret key to the whole vehicle controller and/or the handheld device and carries out encryption communication by using the new secret key; the battery management device judges whether the communication with the handheld equipment is finished or not, and if the communication is not finished, the communication is continued; otherwise, the battery management device and the handheld device finish communication after saving the current secret key.
The Battery Management System (BMS) holds the private key and starts data exchange using the encrypted communication data. The information covered by the battery management device BMS is overlaid with the private key of the user in real time through software, and the interaction process of all the information is data containing encrypted information. In the data communication process, the secret keys are overlapped and updated in real time, the overlapped secret keys of all data at different moments are different, and the communication process needs to use the latest secret key for communication.
The embodiment enables the data of the battery management device not to be stolen easily and the battery system not to be controlled easily through technical encryption, so that the battery system is safer.
Fig. 2 shows a flow chart of a battery management method of an integrated safety unit according to the present invention. The specific steps of the battery management method of the integrated safety unit according to the present invention will be described in detail with reference to fig. 2.
Specifically, the handheld device and/or the vehicle control unit sends a key set by a battery owner to the battery management device.
And step 204, the encryption chip generates a new secret key in real time by using a secret key algorithm, and sends the new secret key to the battery management device, and the battery management device sends the new secret key to the vehicle control unit and/or the handheld device and performs encryption communication by using the new secret key.
Specifically, the battery management device interacts with the information of the encryption chip after receiving the correct secret key, and the encryption chip feeds back the current real-time secret key value. The battery management device sends a real-time secret key to the handheld equipment and/or the vehicle control unit and communicates according to the latest secret key; after receiving the secret key, the handheld device and/or the vehicle control unit starts to carry out encrypted communication according to the latest secret key.
Specifically, after the whole vehicle is started, the communication between the whole vehicle controller and the battery management device is always performed, and the communication is not finished; the battery management device needs to judge whether the communication with the handheld device is ended or not, and if the battery management device judges that the communication with the handheld device is ended, the battery management device and the handheld device simultaneously keep the current and latest secret key. Here, it should be noted that the battery management apparatus also needs to determine whether or not the communication with the charging device is completed, but since the communication between the battery management apparatus and the charging device does not need to be encrypted, the battery management apparatus directly ends the communication after determining that the communication with the charging device is completed.
FIG. 3 illustrates a flow diagram of user first binding in accordance with the present invention.
After a user purchases a battery system (or a whole vehicle), the private key is set through the handheld device.
In one example, as shown in fig. 3, setting a private key for a user, performing a first user binding includes:
In one example, the key algorithm includes: carrying out bitwise XOR on the private key to obtain an original characteristic key; updating the original characteristic secret key by using an encryption chip to obtain a real-time characteristic secret key; obtaining a CRC-8 secret key based on the CRC-8 polynomial; a new key is generated based on the CRC-8 key and the real-time feature key.
Specifically, a private key set by a user through a handheld device is 6-bit, the private key is firstly subjected to bitwise XOR to obtain an original characteristic key with the size of one byte, the original characteristic key is set into an encryption chip, the inside of the encryption chip is circulated by +1, and the original characteristic key is cleared after reaching 255 and is stored and updated to an MCU in real time; then, the MCU calculates a CRC-8 key by using a CRC-8 polynomial X8+ X5+ X3+ X2+ X1+ 1; and finally, the MCU reads the real-time characteristic key and performs XOR on the CRC-8 key to generate a new key. It should be noted that the MCU is a main control chip of the battery management system, and is also called a single chip.
In one example, the real-time feature key is updated to the MCU of the battery management device in real time, and the battery management system is powered back up to recover the original feature key.
We take the user setting 201712 as the private key as an example.
Firstly, a user sets a private key 201712(0x32, 0x30, 0x31, 0x37, 0x31 and 0x32) as a private key through a handheld device, the private key is subjected to bitwise exclusive-or, and an original characteristic key of 0x07 is obtained;
the encryption chip receives 0x07 for the first time, keeps and outputs 0x07 to the MCU, and then is cleared to zero and restarted after the power is turned on again by +1 and 255 (if the battery management system is turned on again, the original characteristic key is restored to be 0x 07);
the MCU synchronously calculates a CRC-8 key (exclusive OR of 0X2E by bytes) of data to be transmitted according to a CRC-8 polynomial X8+ X5+ X3+ X2+ X1+1(0X 2E);
and the MCU performs exclusive OR on the CRC-8 key and the real-time characteristic key to serve as a new key and transmits the new key and the data together.
In the embodiment, the encryption chip is added on the mainboard of the battery management device, the key algorithm and the communication mechanism are added on the mainboard software of the battery management device, and the key algorithm and the communication mechanism are synchronously added in the software of the handheld device and the whole vehicle controller which are in information interaction with the battery management device, so that the battery management device can effectively protect the data in the battery, and the control of the battery system is safer by implementing the encryption algorithm.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. A safety unit integrated battery management apparatus, comprising:
the battery management device collects battery information, controls the jump of the battery state and protects the battery;
the encryption chip is arranged on the battery management device and used for encrypting communication data interacted between external equipment and the battery management device;
the battery management device is connected with the handheld equipment, the vehicle control unit and the charging equipment through a CAN bus;
the handheld device is used for binding the private key for the first time, changing the private key and diagnosing the functional fault of the whole vehicle;
the vehicle control unit and/or the handheld device sends a private key set by a user to the battery management device;
the encryption chip generates a new secret key in real time by using a secret key algorithm, and sends the new secret key to the battery management device, and the battery management device sends the new secret key to the vehicle control unit and/or the handheld device and performs encryption communication by using the new secret key;
the battery management device stores the private key and judges whether the private key is correct or not, and information covered by the battery management device is superimposed on the private key of the user in real time;
in the data communication process, based on the private key, the key is overlapped and updated in real time, the overlapped keys of all data at different moments are different, and the communication process uses the latest key for communication;
the battery management device judges whether the communication with the handheld equipment is finished or not, and if the communication is not finished, the communication is continued; otherwise, the battery management device and the handheld equipment finish communication after storing the current secret key;
setting a private key for a user, and performing first user binding comprises the following steps:
initializing the battery management device by using the handheld equipment;
the user sets the private key through the handheld device and sends the private key to the battery management device;
and the battery management device receives the private key and feeds back successful encryption binding after initializing the encryption chip.
2. The safety unit-integrated battery management apparatus according to claim 1, wherein the vehicle control unit obtains data of the battery management apparatus and sends a control command to the battery management apparatus.
3. The safety unit integrated battery management apparatus according to claim 1, wherein the charging device is configured to charge a battery.
4. The safety unit-integrated battery management apparatus according to claim 2, wherein the battery management apparatus comprises a control unit, and the control unit receives a control command sent by the vehicle control unit to control the jump of the battery state.
5. The integrated security unit battery management apparatus of claim 1, wherein the communication data is exchanged in a message.
6. The safety-unit-integrated battery management apparatus according to claim 1, wherein the battery information includes: battery grouping information, battery SOC, battery capacity, battery charge-discharge power, and battery fault information.
7. A battery management method of an integrated safety unit using the battery management apparatus of an integrated safety unit of any one of claims 1 to 6, the method comprising the steps of:
setting a private key for a user, and binding the user for the first time;
the vehicle control unit and/or the handheld device sends a private key set by a user to the battery management device;
the battery management device judges whether the private key is correct or not, and if not, the communication is directly ended; otherwise, the private key is sent to an encryption chip;
the encryption chip generates a new secret key in real time by using a secret key algorithm, and sends the new secret key to the battery management device, and the battery management device sends the new secret key to the vehicle control unit and/or the handheld device and performs encryption communication by using the new secret key;
the battery management device judges whether the communication with the handheld equipment is finished or not, and if the communication is not finished, the communication is continued; otherwise, the battery management device and the handheld equipment finish communication after storing the current secret key;
the information covered by the battery management device is superimposed with a user private key in real time; in the data communication process, the private key is used as a basis, the keys are overlapped and updated in real time, the overlapped keys of all data at different moments are different, and the communication process uses the latest key for communication.
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| CN112622692B (en) * | 2020-12-17 | 2022-06-14 | 浙江钱江摩托股份有限公司 | Battery pack authentication method for electric vehicle |
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| CN102290848A (en) * | 2011-08-25 | 2011-12-21 | 奇瑞汽车股份有限公司 | Lead-acid battery management system and management method thereof |
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| US20170225589A1 (en) * | 2015-06-29 | 2017-08-10 | Shivinder Singh Sikand | Software-defined vehicular powertrain and method of operation |
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